Steam-jet water heater



June 10 1924. 1,497,623

J 1 VVEIR STEAM JET WATER HEATER Filed Dec. '29. 1921 2 Sheets-Sheet. 1

& "a ll/ ll I I11 I FIG 7.

June 10 1924.

J. G. WEI R STEAM JET WATER HEATER Filed Dec. 29 1921 2 Sheets-Shoot 2Patented June 10, 1324.

I UNITED STATES 1,497,623 PATENT OFFICE.

JAMES GEORGE WEIR, F GLASGOW, SCOTLAND, ASSIGNOR TO G. 60 J. WEIR,LIMITED, CATHCART, GLASGOW, SCOTLAND.

STEAM-JET WATER HEATER.

Application filed December 29, 1921. Serial No. 525,717.

T 0 all whom it may concern:

Be it known that I, JAMES GEORGE TEIR,

a subject of the King of Great Britain and Ireland, residing atCathcart, Glasgow, 5 Scotland, have invented certain new and usefulImprovements in Steam-Jet VVa-ter Heaters; and-I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to letters or figures of reference marked thereon, which form a partof this specification.

This invention relates to steam jet water nozzle heaters, that isapparatus in which water is heated by blowing steam into it, the steambeing condensed in the water. In such heaters the steam is commonly discharged through a nozzle into a combining cone or chamber into whichwater is drawn by the aspirating or injector action of the steam jet,the combining chamber being immersed in the water which it is desired toheat, this water being contained in a tank or other vesselfor example, afeed tank.

The present invention has reference to this nozzle-and-combining-chambertype of heater.

Heaters of this type employed for condensing exhaust steam in feed tanksare subject to heavy pulsations which are very detrimental to the heaterand to the tank. These pulsations commence as the feed water is heatedup and, with heaters adapted to discharge any considerable quantity ofsteam, great trouble is experienced from the pulsations when the feedtank temperature reaches and exceeds one hundred and twenty degreesFahr.

This trouble has been reduced by substi tuting for a single steam jet anumber of small jets, discharging through a number of small nozzles,which act in parallel.

The substitution of a plurality of small nozzles for a single nozzledoes not. however, necessarily eliminate or sufficiently reduce thetrouble. I have found, by experiment, that to adequately diminishvibration it is necessary to limit the internal diameter of the nozzlesto a maximum of three quarters of an inch: a somewhat less diameter ispreferable. Otherwise the periodicity of vibration is sufficiently lowto cause trouble.

The number of nozzles to be employed is, therefore, determined by thequantity of steam dealt with and is not influenced by .the questions ofcondensing surface, kinetic efliciency, or flow of water.

I have also found that it is conducive to the reduction of vibration toform the nozzles of at least three different lengths so that theirvibrations are out of harmony, which reduces still further the intensityof vibration.

The present invention consists in a new and improved combination ofparts. The invention will be described in the following specificationand more particularly defined in the annexed claims.

The accompanying drawings illustrate the carrying of the invention" intoeffect in one convenient manner.

Fig. 1 is a vertical section through a feed tank provided with a heateraccording to the present invention adapted for the discharge of exhauststeam.

Fig. 2 is a longitudinal section through the heater shown in Fig. 1, thesection being taken on line 22 of Figure 3.-

Fig. 3 is a cross section on the line 33 of Fig. 2.

c is the feed tank, 7 the steam pipe conveying steam to the heater, andg the combining chamberof the heater. a, b, c, d are the steam-dischargenozzles. These nozzles consist of tubes, which are passed through, andfixed in, the tube plate 72. This tube plate closes the end of thecombining chamber except for the passages through the tubes. 70, 7c arethe water-admission ports to the combining chamber. Heated water isdischarged from the combining chamber at the end m.

There are (in the present example) four sets of steam discharge nozzles.all the tubes of each set being of the same length, but the lengthsbeing different in the several sets. The actual numbers and lengths ofthese nozzles are r- (I si x nozzles, length five inches.

7)twelve nozzles, length ten inches.

c six nozzles, length fifteen inches. d eight nozzles, length twentyinches. For comparison and to give an example of good practice, it maybe said that the length of the combining cone in the present example,from the tube plate to the dis charge end, is thirty-one inches and itsinternal diameter at the discharge end is nine inches. The diameter ofthe steam-admission pipe at the tube plate is nine and seveneighthsinches, and the steam-discharge nozzles are all of twenty-seventhirty-seconds of an inch external diameter and N0. 10 S. W. G. inthickness.

The steam-discharge nozzles may be divided into a different number ofsets.

Having thus described my invention, What I claim as new and desire tosecure by Letters Patent is 1. In a Water heater the combination With aWater containing tank and a steam-and- Water combining chamber locatedin the said tank of a plurality of sets of steamdischarge nozzles insaid chamber arranged to act in parallel and means for conveying steamto the said nozzles, the several sets being all of different lengths andno nozzle being more than three-quarters of an inch in internaldiameter.

2. In a Water heater the combination with .a Water containing tank and asteam-ami- Water combining chamber located in the said tank of aplurality of sets of steam-discharge nozzles in said chamber, arrangedto act in parallel, the nozzles being arranged in concentric circleswith the longer nozzles predominating in the interior circles and theshorter nozzles predominating in the exterior circles, and no nozzlebeing more than three-quarters of an inch in internal diameter.

I hereby sign my name to this specification.

JAMES GEORGE WEIR.

